[Wien] runsp_c_lapw, how it work?

[kongshi]

Dear user:

     I recently do some calculations of non-magnetic systems with LDA+U. The
user's guide suggests me to do it by the runsp_c_lapw. I only know it
"constrains" the magnetic moment in a spin-polarized setup to zero. 
But I don't how it works such as what formula it according to which
different to magnetic calculation with LDA+U (runsp_lapw).
Thank you ahead.
 
 
 
Kongshi 
 
 
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